The programs "fourd.f90 and fourdcu.f90 implement the
scattering equations described in J. H. Richmond, "Scattering by
a Dielectric Cylinder of Arbitrary Cross Section Shape." IEEE
Trans. on Antennas and Propagation, vol AP-13, pp 334-341, May
1965.  The output of these programs, out.dat, is a field strength
around the dielectric cylinder as a function of angle.

	A similar program was used for parameter studies for the
design of the AGM-129 Advanced Cruise Missile.  See:
http://www.fas.org/nuke/guide/usa/bomber/acm.htm and take a close
at the picture that shows a number of missiles in the factory.

	These programs take two input files, wing.dat and source.dat

	The file wing.dat is generated by running the program
airfoil.py. This generates a description of a wing. Airfoil.py
can be run without any input parameters but it can take the
number of cells in the decomposition.

	The file source.dat contains three lines.  The first gives
the method used to solve the linear system. It is one of the
following:

	cgesv      => use the LAPACK lu decomposition routine
    invert     => a simple and slow matrix inversion routine 
    cula       => use the CULA version of cgesv

	*** The cula option is only valid for fourdcu.f90 ***

	The second line of source.dat gives the wavelength of the
radar in meters.

	The third line gives the width of the radar beam in +/-
degrees.

	The programs mkl.f, mkl.c, nrf.f90, and nrfcuda.f90 are some
other test programs.

	The makefile contains options for several versions.

fourd.mkl
	builds using the mkl version of cgesv and Intel compiler

fourd.pg
	use Portland Group compiler and their non-optimized version
of cgesv

fourd
	use the NAG/g95/gfortran compiler and a version of cgesv based
on routines form the Numerical Recipes in Fortran book

fourd.cuda
	use the NAG/g95/gfortran compiler and the cula version of cgesv

fourd.intel
	use the Intel compiler and a version of cgesv based on
routines form the Numerical Recipes in Fortran book

	The makefile also creates the wing.dat file if it does not exist.
	
	As of Jan 28, 2010 the Portland Group and Intel compilers are now
installed on cuda1.  

****** My settings for cuda1.mines.edu are:
	
#for cuda
export LD_LIBRARY_PATH=/usr/local/cuda/lib64:/usr/local/cuda/cudaprof/bin:$LD_LIBRARY_PATH
export PATH=$PATH:/usr/local/cuda/bin
export PATH=$PATH:$HOME/cuda/bin/linux/release
export MANPATH=$MANPATH:/usr/local/cuda/man
export CUDA_INC_PATH=/usr/local/cuda/include

#for cula 
export CULA_ROOT="/usr/local/cula"
export CULA_INC_PATH="$CULA_ROOT/include"
export CULA_BIN_PATH_64="$CULA_ROOT/bin64"
export CULA_LIB_PATH_64="$CULA_ROOT/lib64"
export LD_LIBRARY_PATH=$CULA_LIB_PATH_64:$LD_LIBRARY_PATH

#for g95
export PATH=$PATH:/home/apps/g95/64/g95-install/bin

#for nag
export NAG_KUSARI_FILE=empower.mines.edu:

#for Portland Group
PGI=/opt/pgi
export PGI

# PATH
if test -z "`echo $PATH | grep $PGI/linux86-64/10.0/bin`"; then
    PATH=$PGI/linux86-64/10.0/bin:${PATH}
    export PATH
fi

# MANPATH
if test -z "`echo $MANPATH | grep $PGI/linux86-64/10.0/man`"; then
    MANPATH=$PGI/linux86-64/10.0/man:${MANPATH}
    export MANPATH
fi